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On its second flight, FOXSI captured evidence of hard X-ray emission from nanoflares. FOXSI’s observations of hard X-rays are shown in blue outlining the very hottest regions of the solar atmosphere, superimposed over a soft X-ray image of the Sun from the Japan Aerospace Exploration Agency’s (JAXA) and NASA’s Hinode solar-observing satellite

NASA-funded rocket to view Sun with x-ray vision

Sun, the hot ball of glowing gases at the heart of our solar system. Most of the gas — 91 percent — is hydrogen....